NORTH AMERICAN EDPHORBIACEiE. 8.* 



o 



Euphorbia serpyllifolia, Pers. Glabrous. Prostrate or 



ascending, dicliotoraously brandling; stems terete, or more 

 or less angled (in the type almost winged); stipules setaceous 

 or lacerate, triangular at the base ; leaves short petioled, 

 oblique at the base, blade varying from spatulate to oblong 

 or obovate, apex truncate or retuse and more or less 

 (^renulate serrate. Inflorescence solitary or in loose leafy 

 clusters ; involucres campanulate, the lobes triangular subu- 

 late; glands transverse oblong, more or less cupped in the 

 centre ; appendages narrow. 3— 4— crenate lobed or nearly 

 entu'e ; stigmas short, bifid. Capsules smooth ; carpels cari- 

 ^late; seeds sharply quadrangular, slightly to manifestly 

 I'ugose between the anirles, the rugfe sometimes so obtuse as 

 to make the surface appear shallow pitted. 

 Just as my collection contains many ascending maculcdas^ 



foil 



'foJ 



^^ this species a doubtful characteristic. As to the leaves, 

 tlie denticulation of the apex though often slight, is always 

 characteristic and constant, so also is the truncation, though 

 tlie form of the blade may vary greatly. The presence or 

 ^^bsence of angles upon the stem offer no guide to the determi- 

 nation. The involucral lobes however never vary, nor do the 

 seeds once carefully examined, ever suggest any other species. 

 The species and its forms appear to range from southern 

 ^I'ltish Columbia east to Lake Superior, thence southward 

 through Wisconsin and Iowa to Texas and northern Mexico, 

 iiicluding all the states and territories west of the 95° longi- 

 ^- The individuals approaching nearest the type that I 

 have examined, are as follows : From Bear Creek, C( " 

 fi- L. Greene, ISSO ; Santa Clara, California, B, F. Leeds, 

 1889; Flagstaff, Arizona, M. E. Jones (399S), 1SS4; and 

 Santa Rosa, California, E. L. Greene, 1S88. 



cation we have respecting the derivation of the type. Mexico then ex- 

 'ended uorth to the forty-second parallel of latitude, inehiding thus the 

 Present ^.tatea and territories of Colorado, Utal), Nevada, California, Ari- 

 ^aa, New ITexico, and Texas. 



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lorado 



